<template>
  <view class="uni-countdown">
    <text v-if="showDay" :style="[timeStyle]" class="uni-countdown__number">{{ d }}</text>
    <text v-if="showDay" :style="[splitorStyle]" class="uni-countdown__splitor">{{ dayText }}</text>
    <text :style="[timeStyle]" class="uni-countdown__number">{{ h }}</text>
    <text :style="[splitorStyle]" class="uni-countdown__splitor">{{
      showColon ? ':' : hourText
    }}</text>
    <text :style="[timeStyle]" class="uni-countdown__number">{{ i }}</text>
    <text :style="[splitorStyle]" class="uni-countdown__splitor">{{
      showColon ? ':' : minuteText
    }}</text>
    <text :style="[timeStyle]" class="uni-countdown__number">{{ s }}</text>
    <text v-if="!showColon" :style="[splitorStyle]" class="uni-countdown__splitor">{{
      secondText
    }}</text>
  </view>
</template>
<script>
import { initVueI18n } from '@dcloudio/uni-i18n'
import messages from './i18n/index.js'
const { t } = initVueI18n(messages)
/**
 * Countdown 倒计时
 * @description 倒计时组件
 * @tutorial https://ext.dcloud.net.cn/plugin?id=25
 * @property {String} backgroundColor 背景色
 * @property {String} color 文字颜色
 * @property {Number} day 天数
 * @property {Number} hour 小时
 * @property {Number} minute 分钟
 * @property {Number} second 秒
 * @property {Number} timestamp 时间戳
 * @property {Boolean} showDay = [true|false] 是否显示天数
 * @property {Boolean} show-colon = [true|false] 是否以冒号为分隔符
 * @property {String} splitorColor 分割符号颜色
 * @event {Function} timeup 倒计时时间到触发事件
 * @example <uni-countdown :day="1" :hour="1" :minute="12" :second="40"></uni-countdown>
 */
export default {
  name: 'UniCountdown',
  emits: ['timeup'],
  props: {
    showDay: {
      type: Boolean,
      default: true
    },
    showColon: {
      type: Boolean,
      default: true
    },
    start: {
      type: Boolean,
      default: true
    },
    backgroundColor: {
      type: String,
      default: ''
    },
    color: {
      type: String,
      default: '#333'
    },
    fontSize: {
      type: Number,
      default: 14
    },
    splitorColor: {
      type: String,
      default: '#333'
    },
    day: {
      type: Number,
      default: 0
    },
    hour: {
      type: Number,
      default: 0
    },
    minute: {
      type: Number,
      default: 0
    },
    second: {
      type: Number,
      default: 0
    },
    timestamp: {
      type: Number,
      default: 0
    }
  },
  data() {
    return {
      timer: null,
      syncFlag: false,
      d: '00',
      h: '00',
      i: '00',
      s: '00',
      leftTime: 0,
      seconds: 0
    }
  },
  computed: {
    dayText() {
      return t('uni-countdown.day')
    },
    hourText(val) {
      return t('uni-countdown.h')
    },
    minuteText(val) {
      return t('uni-countdown.m')
    },
    secondText(val) {
      return t('uni-countdown.s')
    },
    timeStyle() {
      const { color, backgroundColor, fontSize } = this
      return {
        color,
        backgroundColor,
        fontSize: `${fontSize}px`,
        width: `${(fontSize * 22) / 14}px`, // 按字体大小为 14px 时的比例缩放
        lineHeight: `${(fontSize * 20) / 14}px`,
        borderRadius: `${(fontSize * 3) / 14}px`
      }
    },
    splitorStyle() {
      const { splitorColor, fontSize, backgroundColor } = this
      return {
        color: splitorColor,
        fontSize: `${(fontSize * 12) / 14}px`,
        margin: backgroundColor ? `${(fontSize * 4) / 14}px` : ''
      }
    }
  },
  watch: {
    day(val) {
      this.changeFlag()
    },
    hour(val) {
      this.changeFlag()
    },
    minute(val) {
      this.changeFlag()
    },
    second(val) {
      this.changeFlag()
    },
    start: {
      immediate: true,
      handler(newVal, oldVal) {
        if (newVal) {
          this.startData()
        } else {
          if (!oldVal) return
          clearInterval(this.timer)
        }
      }
    }
  },
  created: function (e) {
    this.seconds = this.toSeconds(this.timestamp, this.day, this.hour, this.minute, this.second)
    this.countDown()
  },
  // #ifndef VUE3
  destroyed() {
    clearInterval(this.timer)
  },
  // #endif
  // #ifdef VUE3
  unmounted() {
    clearInterval(this.timer)
  },
  // #endif
  methods: {
    toSeconds(timestamp, day, hours, minutes, seconds) {
      if (timestamp) {
        return timestamp - parseInt(new Date().getTime() / 1000, 10)
      }
      return day * 60 * 60 * 24 + hours * 60 * 60 + minutes * 60 + seconds
    },
    timeUp() {
      clearInterval(this.timer)
      this.$emit('timeup')
    },
    countDown() {
      let seconds = this.seconds
      let [day, hour, minute, second] = [0, 0, 0, 0]
      if (seconds > 0) {
        day = Math.floor(seconds / (60 * 60 * 24))
        hour = Math.floor(seconds / (60 * 60)) - day * 24
        minute = Math.floor(seconds / 60) - day * 24 * 60 - hour * 60
        second = Math.floor(seconds) - day * 24 * 60 * 60 - hour * 60 * 60 - minute * 60
      } else {
        this.timeUp()
      }
      if (day < 10) {
        day = '0' + day
      }
      if (hour < 10) {
        hour = '0' + hour
      }
      if (minute < 10) {
        minute = '0' + minute
      }
      if (second < 10) {
        second = '0' + second
      }
      this.d = day
      this.h = hour
      this.i = minute
      this.s = second
    },
    startData() {
      this.seconds = this.toSeconds(this.timestamp, this.day, this.hour, this.minute, this.second)
      if (this.seconds <= 0) {
        this.seconds = this.toSeconds(0, 0, 0, 0, 0)
        this.countDown()
        return
      }
      clearInterval(this.timer)
      this.countDown()
      this.timer = setInterval(() => {
        this.seconds--
        if (this.seconds < 0) {
          this.timeUp()
          return
        }
        this.countDown()
      }, 1000)
    },
    update() {
      this.startData()
    },
    changeFlag() {
      if (!this.syncFlag) {
        this.seconds = this.toSeconds(this.timestamp, this.day, this.hour, this.minute, this.second)
        this.startData()
        this.syncFlag = true
      }
    }
  }
}
</script>
<style lang="scss" scoped>
$font-size: 14px;

.uni-countdown {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;

  &__splitor {
    margin: 0 2px;
    font-size: $font-size;
    color: #333;
  }

  &__number {
    border-radius: 3px;
    text-align: center;
    font-size: $font-size;
  }
}
</style>
